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Thermic Fume Hood

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INTRODUCTION
A fume hood is a ventilated, enclosed workspace intended to capture, Contain and exhaust harmful or dangerous chemical fumes, vapors and Particulate matter generated by procedures conducted within the Hood. No hepa filtration of either the intake or exhaust air takes place. The air is exhausted outside the laboratory. This makes a fume hood Most suitable for chemical use and other work where sterility is not a Concern. Fume hoods should be utilized for hazardous drug or Chemical preparation and use with various waste anesthetic gases The fume hood protects users by containing and exhausting airborne Hazards; it does this by onstantly pulling the hood air/fumes and Exhausting it directly outside the building through exhaust. Fume Hood sashes also provide shielding in the event of an explosion or fire Inside the hood.
Laboratory fume hoods are a type of ventilation system with the primary function to exhaust chemical fumes, vapors, gasses, dust, mist and aerosol. Fume hoods also serve as physical barriers between reactions and the laboratory, offering a measure of protection against inhalation exposure, chemical spills, run-away reactions and fires. Experimental procedures are performed within the hood which is consistently and safely ventilated, by means of an extract blower and ductwork. The hood functions by maintaining a relatively negative pressure in the interior of the hood to prevent any contaminant from escaping while drawing air in through the hood opening at a consistent rate. A suitable hood face velocity (the speed at which air is drawn into the hood) is of importance to the safe and effective operation of a fume hood. While excessive face velocities can often result in turbulence and reduce containment, insufficient velocities can also compromise hood performance. Fume hoods are recommended for exhaust from the hood working area, of gases, vapour, toxic particles, odour to improve working environment of people who regularly handle toxic substances. Reduces personal exposures and odor level in the laboratory.

These are designed to exhaust toxic, or otherwise harmful apours etc., for protecting laboratory personnel & equipment. A motor- blower exhaust system ( optional) generates negative pressure within the hood, extracting the contaminated air from the work area and expelling it into the atmosphere and preventing the fumes from escaping into the room. These are recommended for various laboratories like bio-chemistry, pharmaceutical units, printed circuit etching/cleaning etc. The work surface (worktable) is of stainless steel sheet. A small p.p. Sink, water tap and water outlet provided. A sliding door made of acrylic, moves vertically up/down with counter balanced weight operated by steel rope. Hood is provided with fluorescent light for easy working in the chamber. A metal clad socket and gas cock is also provided in the chamber. The control panel is fitted with on/off switches for mains, motor-blower and tube light and mains indicator. Computer with cardboard. Power supply : 220v, single phase, 50 cycles, ac
TECHNICAL SPECIFICATIONS

  1. Control panel:- switch button
  2. Design structure:- aerodynamic, floor mounted
  3. Airflow type:- Low constant volume (for A.C. Environment)
  4. Powder coating:- Complete GP parts shall be processed with multi tank pre- treatment and Finished with highly corrosion resistant epoxy powder coating with 100 microns thickness.
  5. Material of construction of superstructure Galvanized iron (GI) as per is 277: 2003 standard of
    • 1.2 mm thickness for all sheet metal paneling
    • 1.2 mm for back pillars
    • 1.2 mm for front corner post
  6. Front top panel easily openable hinged gas spring based top panel for easy access to flow control valve and electrical lighting fixtures for maintenance.
  7. Corner post Triangular profiled corner post is placed on lhs and rhs of the fume hood and It houses the utility line fittings and electrical receptacles.
  8. Inside chamber stainless stell 304/ bakelite sheet
  9. Exhaust system exhaust system (for light, normal & heavy fumes) with baffle to ensure rapid exhaust of fumes.
  10. Airfoil aerodynamic design, horizontal fixed airfoil mounted on the worktop
  11. Worktop Chemical resistant splash & spillage proof dished 'Jet Black Granite' worktop (18 +1 Mm thick). Skirting of 15 mm from all sides for no chemical spillage.
  12. Sink, water tap with drain arrangement worktop will have sink sealed with silicon sealant for drainage with water tap on left back side of worktop. Sink will have a trap for waste collection.
  13. Sash (shutter) vertical rising sash counter-balanced with pulley and counter-weight system. Toughened float glass sash (5 mm thick). Smooth and light sash operation. Clear openable height = 750 mm. Impact resistance of the sash (toughened glass) is four times higher than other sash materials (like safety glass and polycarbonate). Breaking stress value for fully toughened glass (tempered glass) =
    • Aerodynamic sash handle
    • Single finger movement/ motorized (optional)
  14. Wet & Dry service valves: remotely operated color coded valves for fine control over utilities (as per din 12920 norms) total 5 nos. Service valves with flexible hose with 6mm internal dia, withstands up to 5kgf pressure (all LHS)
    • 1 for raw water (PU)
    • 1 for nitrogen(PU)
    • 1 for vacuum(Teflon)
    • 1 for comp. Air (PU)
  15. Maintenance Ports
    • Openable top panel for easy maintenance of tube light and flow control valve
    • Rectangular service panel for maintenance of utility valves and tubing.
  16. Internal nozzles brass powder coated fittings are staggered in the fume hood to avoid the intermingling of the flexible tubes. Also, the taps are tapered in shape to use with flexible tubing of sizes from ¼" to ½" in dia, to provide greater flexibility to the user. Note: - our scope of supply for utility lines ends at 1/4th bsp male adopter.
  17. lightingfluorescent light (40 watt, 2 nos.) With vapor-proof fitting for proper illumination. Intensity approx 400 lux at worktop level. Diffused light only, no direct lighting.
  18. Electrical utilities 6 nos. Electrical sockets crabtree/ equivalent make (230 v, 6/16 a, 50 hz), 6 nos. Crabtree/ equivalent make mcbs. Light switch on front fascia. Cables & wires 'fire retardant low smoke' grade.
  19. Cable entering port dia 100 mm cable entry tunnel from fume hood front post to inner liner. With a plastic cover. For easy access of cables from fume hood to electrical sockets.
  20. Chemical storage base cabinet (ventilated & on castors) base cabinet will be ready to receive the fume hood at its top. It will have following features:
    • Completely made from 1.2 mm thick gp sheet with highly corrosion resistant epoxy powder coating,100 microns thickness.
    • Cabinet integral work walls will be special chemical & heat resistant, smooth finish, easily cleanable panels made from durable sheets.
    • One removable horizontal partition to store chemicals.
    • Cabinets on castors.
    • Roller catch for the base cabinet doors.
  21. Apparatus holding grid (lattice assembly) a grid made up of epoxy powder coated rod (dia. 12.7 mm) to hold the apparatus. It will cover the entire length of the fume hood and will be built-in at fume hood backside. Installed at the distance of 150 mm from backside of fume hood.
  22. Exhaust port Unique exhaust port design ensures that the fumes will be exhausted smoothly Without any turbulence at the exhaust port. Also, it ensures low noise level.
  23. Noise level < 70db at 1 meter from fume hood.
  24. Sash lock At 450 mm to restrict movement


TECHNICAL DETAILS

Work Top
Jet-Black Granite “or” Premium Black with chamfer moulding at the front & groove at the bottom to avoid chemical spillage on the modules or on the floor work top will be made of 16 to 19mm thick. worktop will be fixed with the module by foam tape and all joints are sealed thru epoxy sealant, with low water absorption.
Material Of Construction
Material of construction will be made of 1 mm Galvanized Plain Sheets (GP SHEETS SP) with 120gm zinc coating. Resistance to corrosion & high impact strength, powder coated.
Under Bench Module
Under bench module will be made of 1 mm GP sheets. The entire module is made up of gp panels and are bolted/rivetted for achieving maximum strength with high corrosion resistance. The shutters or doors are mounted to the modules by soft close hinges with soft closing mechanism which are openable to 95 degree. Drawers are mounted with the ball bearing based soft touch telescopic slides which are sturdy & able to take load up to 45 kg.
Switch & Sockets
North-West / Crabtree make: electrical socket with mcb 15amp with wiring.
Powder Coating
Complete module & frame work are processed with multi-tank pre- treatment and finished with highly corrosion resistant 'Kansai Nerolac/Equivalent' epoxy powder coating with minimum 100 microns thickness.



HARDWARE FITTINGS

Hinges
  • 2 hole clip on soft close full overlay
  • Version :- With soft closing mechanism with no sound
  • Concealed hinge version:- Full overlay
  • Material:- Steel
  • Opening angle: - 110°, cup drilling depth: - 12.5 mm
  • Adjustment facility: - Side adjustment 0 - 3 mm, height adjustment ±3 mm,
  • Depth adjustment - 1 - 4 mm
  • Installation:- Screw Fixing
Handle
U Handles, mounting from the back, should be resistant to corrosion, in laboratory environment, slip polish, shiny metallic, should be rigidity & agronomical shaping.
Screw
All S.S. 304 screws.
Lock
Multi-pupose lock for drawers 22 mm 120 key combinations, with 02 key/ Finger print lock.
Drawer Channel
Ball bearing runners, single extension, steel with self closing mechanism and smuso soft closing mechanism. Can bear the load upto 40 kg with type of pull out:- full extension removing the running track:- without release lever
Material:- steel and plastic, screwed with chipboard screw, hospa, countersunk head, pz, fully threaded
Utility Taps
Three way laboratory tap virgin brass material coating: teflon epoxy mix Glossy coating, filter unit at inlet, filter unit at outlet nozzle Waterflow around 39 ltrs /min at 3 bars pressure test, pressure: 9 bars/air, max working pressure: 10 Bars.
Surface Protection - Teflon mix epoxy powder coating ral 7035, materials - brass (100% virgin grade) Handle knob in pp / abs – pp, headwork sealing, epdm temperature working range: 0-90° Ceramic temperature working range: 0-90°, connection tap, male thread g1/2” Non-corrosive material for corrosive chemicals excellent chemical resistance ( against – strong acids , alkline solutions )
Exhaust Blower
Construction : Chemical & heat resistant blower with aerodynamically balanced impeller, motor: copper binding motor of reputed’ make. Drive: direct drive, air suction as per requirement.
Polypropylene Sink
Oval Shape with bottle traps & nipples, MOC: polypropylene, 8mm thickness, black in colour, water discharge hole 40 mm dia, Resin properties:- melt flow index (2300c & 2.16 kg) ASTM D 1238 gm/10 min 11.0,density @ 23oc ASTM D 1505,gm/cm3 0.90 Mechanical properties:- tensile strength @ yield (50 mm/min) ASTM D 638 mpa> 23.0,elongation @ yield (50 mm/min) ASTM D 638 % 6.0,flexural modulus (1.3 mm/min) ASTM D 790 mpa 1200,notched izod impact strength @ 23oc ASTM D 256 J/m 100 Thermal properties:- heat deflection temperature (0.46 n/m2) ASTM D 648 oc>95, vicat softening point (10 N) ASTM D


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